class Point{
	int x,y;
	void setXY(int m,int n){
		x=m;
		y=n;	
	}
}
public class Example4_4{
  public static void main(String args[]){
	Point p1,p2;
	p1 = new Point();
	p2 = new Point();
	System.out.println("p1的引用："+p1);
	System.out.println("p2的引用："+p2);
	p1.setXY(1111,2222);
	p2.setXY(-100,-200);
	System.out.println("p1的x,y坐标："+p1.x+","+p1.y);
	System.out.println("p2的x,y坐标："+p2.x+","+p2.y);
	p1 = p2;
	System.out.println("将p2的引用赋给p1后：");
	System.out.println("p1的引用："+p1);
	System.out.println("p2的引用："+p2);
	System.out.println("p1的x,y坐标："+p1.x+","+p1.y);
	System.out.println("p2的x,y坐标："+p2.x+","+p2.y);
	}
}

